TRAE Thermal Expansion Valve - …

1 TRAE Thermal Expansion ValveTRAE Thermal Expansion ValveInstruction SheetPA-00192 June 2013 TRAE Thermal Expansion valves are designed to meet the specific demands of refrigerated display cases, reach-in & walk-in coolers and freezers, and commercial applications ranging from medium (+50 F) temperature, with proper charge. Designed for R-12, R-22, and NOMENCLATUREE xample: TRAE 15HW100 TRAE 15 H W 100 Valve Capacity Refrigerant Code Charge MOP Series (Nominal Rating F = R-12 Code (optional) in tons) H = R-22 R = R-502 SAFETY INSTRUCTIONS1. Read Installation Instructions thoroughly. Failure to follow instructions may result in Valve failure, system damage or personal Do not use on service conditions or fluids not specifically cataloged without prior approval of the Emerson Climate Technologies Flow Controls Division Applications Engineering Department.

2 Use of Thermal Expansion valves on applications not specifically cataloged can result in personal injury, Valve failure and/or system Protect against excessive vibration, which may cause the bulb tube to break, resulting in Valve failure or Foreign matter in the Expansion Valve may cause diaphragm failure, flooding, or starving. Use of a liquid line filter-drier is strongly valves are factory-set to a specific superheat. If adjustment is needed, refer to superheat adjustment instructions for proper procedure. Improper adjustment may result in Valve malfunc-tion and/or system Be sure the Valve is installed with the flow arrow on the Valve body corresponding to the flow direction through the system On valves with solder connections, remove the power assembly, cage assembly and gaskets prior to Use back-up wrench on all wrench flats.

3 Over-torquing may result in Valve body Proper Valve sizing is important. An oversized Valve may result in erratic control. An undersized Valve may consider-ably reduce system Do not exceed the Valve 's maximum working pressure of 450 psig-if exceeded, internal Valve pressure could cause damage to the diaphragm, resulting in Valve Do not exceed maximum working temperature. Excess temperatures could cause internal damage, resulting in Valve Bar stock body ODF connections External equalizer Corrosion-resistant materials Interchangeable with currently available TXVsFigure 1 Always direct torch flame awayfrom Valve body when 2 EXTERNAL EQUALIZEREVAPORATORREMOTEBULBEXPANSIONVA LVEDISTRIBUTORINCORRECTREMOTE BULB LOCATIONSHOWN TRAPPEDEXTERNAL EQUALIZEREVAPORATORREMOTEBULBEXPANSIONVA LVEDISTRIBUTORCORRECTREMOTE BULB LOCATIONSHOWN FREE-DRAININGEXTERNAL EQUALIZEREVAPORATORREMOTEBULBEXPANSIONVA LVEDISTRIBUTORINCORRECTREMOTE BULB LOCATIONSHOWN TRAPPEDEXTERNAL EQUALIZEREVAPORATORREMOTEBULBEXPANSIONVA LVEDISTRIBUTORCORRECTREMOTE BULB LOCATIONSHOWN

4 INSTRUCTIONS1. Warning: Before opening any system, make sure the pressure in the system is brought to and remains at atmospheric pressure. Failure to comply can result in system damage and/or personal valves may be installed in any position, but should be located as close as possible to the distributor or evapora-tor Be sure Valve is installed with its flow arrow correspond-ing to the flow direction thru the Install line connections to Valve . On valves with solder connections, wrap wet cloths around the Valve to prevent Valve damage while brazing. Direct torch away from Valve (see Figure 1). Use backup wrench on all wrench Attach the remote bulb to the suction line as close to the evaporator outlet as possible on a horizontal run.

5 Posi-tion the bulb at the 4 or 8 o clock position. Clean surface of suction line where the remote bulb is to be attached, and then securely fasten the bulb with straps provided. If the remote bulb can be affected by the surrounding ambient, then the bulb should be insulated with a material that will not absorb water. See figure Connect one end of the external equalizer line to the Valve . Connect the other end to the suction line slightly downstream from the remote bulb location and posi-tioned so that it cannot siphon oil from the suction Check for leaks, sufficient system refrigerant charge, and be sure no flash gas is present before attempting to check Valve The Expansion Valve must be free of all contaminants - install a liquid line filter-drier before the SAE Connection: Use special care to not over tighten fittings.

6 Use back-up wrench on all wrench SUPERHEAT1. Determine the suction pressure with an accurate gauge at the evaporator outlet (see P in figure 3). On self-contained systems, the suction pressure may be read at the compressor suction From refrigerant pressure-temperature tables, determine saturation temperature at observed suction pressure (TEMPP).3. Measure temperature of suction gas at Thermal expan-sion Valve remote bulb location (TEMPT).4. Subtract saturation temperature (read from tables in step 2) from temperature measured in step 3, the difference is the superheat of the suction ADJUSTMENTTXVs are factory set to a specific superheat - however, the superheat should be adjusted for the application.

7 To adjust the Valve to other superheat settings:1. Remove the seal cap from bottom of Turn the adjustment screw clockwise to increase super-heat and counterclockwise to decrease superheat. One complete 360 turn changes the superheat approximately 3-4 F, regardless of the refrigerant type. As much as 30 minutes may be required for the system to stabilize after the adjustment is Replace and hand-tighten seal AND OPERATION The TRAE Valve is currently replacing conventional TEV's on air conditioning and refrigeration systems with any combination of the following system operating conditions:1) Widely varying evaporator loads; 2) Widely varying head pressures; 3) Widely varying pressure drop available across the thermostatic Expansion Valve and refrigerant distributor; or, 4) Fluctuating or extremely low liquid temps.

8 Severe conditions are those which drastically increase a conventional Expansion Valve 's maximum capacity: high head pressures for example, also, low liquid temperatures that would be experienced on a system with mechanical subcoolers during summer operation. TRAE high system performance is possible because the large diaphragm allows the Valve to operate with the Valve pin controlling very close to the seat. This provides stable control at minimum changes in stroke, enabling a large port to handle small loads. Compared to a standard TEV, the TRAE's larger port will improve system pulldown. Problems can occur with refrigeration systems during both high and low ambient conditions when the condensing temperature is allowed to follow the ambient.

9 As the evapo-rator temperature remains reasonably constant, this results in extreme pressure drop changes across the Valve . These pressure drop changes can result in a conventional Valve not maintaining a constant superheat at the evaporator outlet. These superheat changes can result in the evaporator starving in low ambient conditions and flooding in the higher ambient, depending on the Valve design. Another variable factor for this situation is how low the head pressure is allowed to decrease. This of course depends on whether heat reclaim is utilized for heating purposes, or if hot gas will be used for evaporator 3 TEMPT TEMPP = SUPERHEAT 40 33 = 7 69 PSIG = 40 F59 PSIG = 33 F59 PSIG = 40 FEXTERNAL EQUALIZER59 PSIG40 FTPS uperheat MeasurementFigure 5 Recommended remote bulb location and schematic piping for rising suction 7 Remote bulb location on large and small suction 4 Correct remote bulb location on "short-circuiting"evaporator to prevent 6 Recommended remote bulb location and schematic piping for rising suction 4-7 provide service hints for remote bulb Support.

10 1-866-625-8416PA-00192 (06/13) Emerson is a trademark of Emerson Electric Co. 2013 Emerson Climate Technologies, Inc. All rights ,02,5611 ,0641 ,01,58 , ,0641/3-6 EVLAVEARTEPYT)FDO(seziSlanimotNelntIeltu OB-telnEI-telnIACDFYDOBEARTIEZIS8/58/723 /12-123/7123/13-14/38/1-213/31-223/928/7 8/723/13-14/323/13-14/38/1-213/31-223/92 8/3-213/91-223/138/1-18/1-123/31-223/922 3/31-223/928/3-213/91-223/1323/91-223/13 YDOBEARTIIEZIS8/78/761/1-24/361/1-24/38/ 1-21/1-223/928/3-611/11-223/138/1-18/1-1 2/1-223/922/1-223/928/3-213/91-223/138/3 -611/11-223/13 TRAE Rough-In Dimensional TableTRAE Body Size IR-22 Available Tonnages: 10, 15, 20, 30, 40 TRAE Body Size IIR-22 Available Tonnages: 50, 60, 70 LENGTHLENGTH